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Finding the Fourth Proportional to 719.67, 1,080.20 and 446.30

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Solution

The fourth proportional to 719.67, 1,080.20 and 446.30 is: 669.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    719.67 : 1,080.20 = 446.30 : x
  2. Step 2: Convert to fraction form
    719.67/1,080.20 = 446.30/x
  3. Step 3: Cross multiply
    719.67x = 1,080.20 × 446.30
  4. Step 4: Simplify right side
    719.67x = 482,093.26
  5. Step 5: Solve for x
    x = 482,093.26/719.67
  6. Step 6: Final answer
    x = 669.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.